I park my car in the winter and during the summer only put on about 2500 miles. Last year I put in synthetic oil. How often should I change my oil
The answer is in your owner’s manual.
With that kind of use I’d change it once a year, right before you store it.
Once a year is fine. I would do it when it comes out of storage, ready to be used again. It may not really matter.
Once a year before storage and I wouldn’t bother with synthetic.